Well you need to meet their requirements in many things, so though you'll meet their GCSE requirement and make yourself stand-out in that area from the other applicants (obviously the more A*'s you have the better), you still need to meet their criteria in other areas. Your A level choices and grades will be just as important, as will your personal statement, your reference, your interview (if you have one), your admissions tests (if you have one) etc.